Cover	12 Months Ended
Cover	Sep. 30, 2023
Cover [Abstract]
Entity Registrant Name	ONEWATER MARINE INC.
Amendment Flag	false
Document Type	DEF 14A
Entity Central Index Key	0001772921

Pay vs Performance Disclosure - USD ($)

12 Months Ended

Sep. 30, 2023

Sep. 30, 2022

Sep. 30, 2021

Pay vs Performance Disclosure

Pay vs Performance Disclosure, Table


Year	Summary Compensation Table Total for PEO($)(1)(2)	Compensation Actually Paid to PEO(1) (3)	Average Summary Compensation Table Total for Non-PEO NEOs($)(4)	Average Compensation Actually Paid to Non-PEO NEOs(4) (5)	Value of Initial Fixed $100 Investment Based On:(6)		Net (Loss) Income ($) (thousands)	Adjusted EBITDA(8) ($) (thousands)
					TSR($)	Peer Group TSR($)(7)
2023	3,018,707	1,837,482	2,326,709	1,438,593	130.56	123.07	(39,111)	167,412
2022	3,741,301	2,685,035	2,591,879	1,804,034	153.44	112.97	152,611	247,587
2021	4,427,902	8,247,303	3,008,981	6,062,872	204.91	147.68	116,413	155,840

Company Selected Measure Name

Adjusted EBITDA

Named Executive Officers, Footnote

Our PEO was P. Austin Singleton during fiscal years 2021 through 2023.Our Non-PEO NEOs were Anthony Aisquith and Jack Ezzell during fiscal years 2021 through 2023.

Peer Group Issuers, Footnote

The TSR Peer Group is the Russell 2000 index as used in the Company's performance graph found in the Company's 10-K.

PEO Total Compensation Amount

$ 3,018,707

$ 3,741,301

$ 4,427,902

PEO Actually Paid Compensation Amount

$ 1,837,482

2,685,035

8,247,303

Adjustment To PEO Compensation, Footnote

Compensation actually paid does not mean that our PEO was actually paid those amounts in the listed year. Instead, this is a dollar amount derived from the starting point of the Summary Compensation Table total compensation under the methodology prescribed under the relevant SEC rules and as reflected in the adjustment table below.


PEO
	2023		2022		2021
Summary Compensation Table Total	$	3,018,707	$	3,741,301	$	4,427,902
Add (Subtract):
Subtract amounts reported under the “Stock Awards” column in the Summary Compensation Table	(1,500,050)		(1,500,034)		(2,181,096)
Addition of fair value at year-end of equity awards granted during the year that remain unvested as of year-end	816,868		1,198,137		4,415,460
Fair value at vesting date of awards granted during the year and vested in the same year	—		644,034		300,161
Change in fair value of equity awards granted in prior years that were unvested as of year-end	(472,709)		(1,429,029)		1,203,930
Change in fair value of equity awards granted in prior years that vested during the year	(126,321)		(17,654)		67,768
Equity awards granted in prior years that were forfeited during the year	—		—		—
Dividends or other earnings paid on equity awards during the year	100,987		48,280		13,178
Compensation Actually Paid	$	1,837,482	$	2,685,035	$	8,247,303

Non-PEO NEO Average Total Compensation Amount

$ 2,326,709

2,591,879

3,008,981

Non-PEO NEO Average Compensation Actually Paid Amount

$ 1,438,593

1,804,034

6,062,872

Adjustment to Non-PEO NEO Compensation Footnote

This figure is the average of compensation actually paid for our NEOs other than our PEO in each year listed. Compensation actually paid does not mean that our NEOs were actually paid those amounts in the listed year, but this is a dollar amount derived from the starting point of the Summary Compensation Table total compensation under the methodology prescribed under the relevant rules as shown in the adjustment table below.


Non-PEO NEO Average
	2023		2022		2021
Summary Compensation Table Total	$	2,326,709	$	2,591,879	$	3,008,981
Add (Subtract):
Subtract amounts reported under the “Stock Awards” column in the Summary Compensation Table	(1,135,773)		(1,000,023)		(1,410,056)
Addition of fair value at year-end of equity awards granted during the year that remain unvested as of year-end	612,677		798,758		2,943,653
Fair value at vesting date of awards granted during the year and vested in the same year	—		429,356		200,121
Change in fair value of equity awards granted in prior years that were unvested as of year-end	(348,256)		(1,101,668)		1,257,953
Change in fair value of equity awards granted in prior years that vested during the year	(97,364)		40,271		53,434
Equity awards granted in prior years that were forfeited during the year	—		—		—
Dividends or other earnings paid on equity awards during the year	80,600		45,461		8,786
Compensation Actually Paid	$	1,438,593	$	1,804,034	$	6,062,872

Compensation Actually Paid vs. Total Shareholder Return

Compensation Actually Paid vs. Net Income

Compensation Actually Paid vs. Company Selected Measure

Total Shareholder Return Vs Peer Group

Tabular List, Table

Adjusted EBITDA

•Aged Inventory

Total Shareholder Return Amount

$ 130.56

153.44

204.91

Peer Group Total Shareholder Return Amount

123.07

112.97

147.68

Net Income (Loss)

$ (39,111,000)

$ 152,611,000

$ 116,413,000

Company Selected Measure Amount

167,412,000

247,587,000

155,840,000

PEO Name

P. Austin Singleton

Additional 402(v) Disclosure

Represents the total compensation paid to our PEO in each year listed, as shown in our Summary Compensation Table for such year listed.Pursuant to SEC rules, the comparison assumes $100 was invested on September 30, 2020. Historical stock price performance is not necessarily indicative of future stock price performance.

Measure:: 1

Pay vs Performance Disclosure

Name

Adjusted EBITDA

Non-GAAP Measure Description

In the Company's assessment, Adjusted EBITDA is the financial performance measure that is the most important financial performance measure used by the Company in 2023 to link compensation actually paid to performance. The Company defines Adjusted EBITDA as net income (loss) before interest expense – other, income tax (benefit) expense, depreciation and amortization and other (income) expense, further adjusted to eliminate the effects of items such as the change in fair value of contingent consideration, gain (loss) on extinguishment of debt, loss on impairment and transaction costs.

Measure:: 2

Pay vs Performance Disclosure

Name

Aged Inventory

PEO | Equity Awards Grant Date Fair Value Granted In Fiscal Year [Member]

Pay vs Performance Disclosure

Adjustment to Compensation, Amount

$ (1,500,050)

$ (1,500,034)

$ (2,181,096)

PEO | Fair Value of Unvested Equity Awards Granted In Fiscal Year [Member]

Pay vs Performance Disclosure